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HD404818 Series

4-Bit Single-Chip Microcomputer

Preliminary

Rev. 2.0

Sept. 1998

Description

T he H D4 04 81 8 Se ri es of 4-bit single-chip HMCS400 series microcomputers provide high program

productivity. It incorporates a large size memory, LCD controller/driver, voltage comparator, and 32-kHz

watch oscillator circuit.

The HD404818 Series has both standard voltage versions and low voltage versions available. The standard

voltage versions operate at 4.0 V to 6.0 V (mask ROM version) and 4.0 V to 5.5 V (PROM version), while

the low voltage versions operate at 2.7 V to 6.0 V (mask ROM) and 3.0 V to 5.5 V (PROM). Low voltage

versions include an L in their product name.

Standard voltage versions: HD404812, HD404814, HD404816, HD404818, HD4074818

Low voltage versions: HD40L4812, HD40L4814, HD40L4816, HD40L4818, HD407L4818

The HD4074818 and HD407L4818, containing PROMs, are ZTAT microcomputers which can

dramatically shorten system development time and smoothly proceed from debugging to mass production.

ZTAT

: Zero Turn Around Time ZTAT is a trademark of Hitachi Ltd.

Features

• 2048-word × 10-bit ROM (HD404812, HD40L4812)

• 4096-word × 10-bit ROM (HD404814, HD40L4814)

• 6144-word × 10-bit ROM (HD404816, HD40L4816)

• 8192-word × 10-bit ROM (HD404818, HD40L4818, HD4074818, HD407L4818)

• 1184-digit × 4-bit RAM

• 30 I/O pins, including 10 high-current output pins, all CMOS and programmable as I/O pull-up MOS

• LCD controller/driver (32 segments × 4 commons)

• Three timer/counters

• Clock-synchronous 8-bit serial interface

• Six interrupt sources

 Two by external sources

 Four by internal sources

1 2 3 4 5 6 7 8 ... 99 100

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